Unsupported operand type(s) for +: 'int' and 'str' about python-workout HOT 3 OPEN

one_item should be int(one_item) IMO.

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Yes, I agree with @jimmy605, when you pass "2" to is_intable function, int() will convert it's type from 'str' to 'int' so is_intable() returns True.
However in sum_intable() it remains a string so summing a 'str' and an 'int' throws a TypeError.
The return of sum_intable() should be

return sum(int(one_item) for one_item in items if is_intable(one_item))

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This issue gave me a lot of trouble. The is_intable fuction returned False when I added '2' but threw a TypeError when I called sum_intable. I never thought I'd have to put int in the return statement. Thanks!

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